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fit3.c

/* 
        fit3.c        (c) 1998  Grant R. Guenther <grant@torque.net>
                          Under the terms of the GNU General Public License.

      fit3.c is a low-level protocol driver for newer models 
        of the Fidelity International Technology parallel port adapter.  
      This adapter is used in their TransDisk 3000 portable 
      hard-drives, as well as CD-ROM, PD-CD and other devices.

      The TD-2000 and certain older devices use a different protocol.
      Try the fit2 protocol module with them.

        NB:  The FIT adapters do not appear to support the control 
      registers.  So, we map ALT_STATUS to STATUS and NO-OP writes 
      to the device control register - this means that IDE reset 
      will not work on these devices.

*/

#define FIT3_VERSION      "1.0"

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/io.h>

#include "paride.h"

#define j44(a,b)                (((a>>3)&0x0f)|((b<<1)&0xf0))

#define w7(byte)                {out_p(7,byte);}
#define r7()                    (in_p(7) & 0xff)

/* cont = 0 - access the IDE register file 
   cont = 1 - access the IDE command set 

*/

static void  fit3_write_regr( PIA *pi, int cont, int regr, int val)

{     if (cont == 1) return;

      switch (pi->mode) {

      case 0:
      case 1: w2(0xc); w0(regr); w2(0x8); w2(0xc); 
            w0(val); w2(0xd); 
            w0(0);   w2(0xc);
            break;

      case 2: w2(0xc); w0(regr); w2(0x8); w2(0xc);
            w4(val); w4(0);
            w2(0xc);
            break;

      }
}

static int fit3_read_regr( PIA *pi, int cont, int regr )

{     int  a, b;

      if (cont) {
        if (regr != 6) return 0xff;
        regr = 7;
      } 

      switch (pi->mode) {

      case 0: w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
            w2(0xd); a = r1();
            w2(0xf); b = r1(); 
            w2(0xc);
            return j44(a,b);

      case 1: w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
            w2(0xec); w2(0xee); w2(0xef); a = r0(); 
            w2(0xc);
            return a;

      case 2: w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc); 
            w2(0xec); 
            a = r4(); b = r4(); 
            w2(0xc);
            return a;

      }
      return -1; 

}

static void fit3_read_block( PIA *pi, char * buf, int count )

{     int  k, a, b, c, d;

      switch (pi->mode) {

      case 0: w2(0xc); w0(0x10); w2(0x8); w2(0xc);
            for (k=0;k<count/2;k++) {
                w2(0xd); a = r1();
                w2(0xf); b = r1();
                w2(0xc); c = r1();
                w2(0xe); d = r1();
                buf[2*k  ] = j44(a,b);
                buf[2*k+1] = j44(c,d);
            }
            w2(0xc);
            break;

      case 1: w2(0xc); w0(0x90); w2(0x8); w2(0xc); 
            w2(0xec); w2(0xee);
            for (k=0;k<count/2;k++) {
                w2(0xef); a = r0();
                w2(0xee); b = r0();
                    buf[2*k  ] = a;
                    buf[2*k+1] = b;
            }
            w2(0xec); 
            w2(0xc);
            break;

      case 2: w2(0xc); w0(0x90); w2(0x8); w2(0xc); 
                w2(0xec);
            for (k=0;k<count;k++) buf[k] = r4();
                w2(0xc);
            break;

      }
}

static void fit3_write_block( PIA *pi, char * buf, int count )

{     int k;

        switch (pi->mode) {

      case 0:
        case 1: w2(0xc); w0(0); w2(0x8); w2(0xc);
                for (k=0;k<count/2;k++) {
                w0(buf[2*k  ]); w2(0xd);
                w0(buf[2*k+1]); w2(0xc);
            }
            break;

        case 2: w2(0xc); w0(0); w2(0x8); w2(0xc); 
                for (k=0;k<count;k++) w4(buf[k]);
                w2(0xc);
            break;
      }
}

static void fit3_connect ( PIA *pi  )

{       pi->saved_r0 = r0();
        pi->saved_r2 = r2();
      w2(0xc); w0(0); w2(0xa);
      if (pi->mode == 2) { 
            w2(0xc); w0(0x9); w2(0x8); w2(0xc); 
            }
}

static void fit3_disconnect ( PIA *pi )

{       w2(0xc); w0(0xa); w2(0x8); w2(0xc);
      w0(pi->saved_r0);
        w2(pi->saved_r2);
} 

static void fit3_log_adapter( PIA *pi, char * scratch, int verbose )

{       char    *mode_string[3] = {"4-bit","8-bit","EPP"};

      printk("%s: fit3 %s, FIT 3000 adapter at 0x%x, "
             "mode %d (%s), delay %d\n",
                pi->device,FIT3_VERSION,pi->port,
            pi->mode,mode_string[pi->mode],pi->delay);

}

static struct pi_protocol fit3 = {
      .owner            = THIS_MODULE,
      .name       = "fit3",
      .max_mode   = 3,
      .epp_first  = 2,
      .default_delay    = 1,
      .max_units  = 1,
      .write_regr = fit3_write_regr,
      .read_regr  = fit3_read_regr,
      .write_block      = fit3_write_block,
      .read_block = fit3_read_block,
      .connect    = fit3_connect,
      .disconnect = fit3_disconnect,
      .log_adapter      = fit3_log_adapter,
};

static int __init fit3_init(void)
{
      return paride_register(&fit3);
}

static void __exit fit3_exit(void)
{
      paride_unregister(&fit3);
}

MODULE_LICENSE("GPL");
module_init(fit3_init)
module_exit(fit3_exit)

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